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A biologist puts a certain number of DNA strands into a machine, which uses a process called PCR cycling. Each PCR cycle, the machine creates a copy of every DNA strand. All of the DNA strands (the original DNA strands and their coples) remain together in the machine, ready for more PCR cycles. If a biologist puts $1$ thousand DNA strands into the machine and runs it for $4$ cycles, how many DNA strands will be in the machine at the end of the process, in thousands?$\newline$$\square$